ci: upgrade GitHub Actions for Node.js 24 compatibility

[ko3n1g]

Summary

Upgrades all GitHub Actions to versions compatible with the Node.js 24 runtime, which GitHub is rolling out as the new runner default.

Action upgrades:

• actions/checkout: any version → v6
• actions/upload-artifact: any version → v6
• actions/download-artifact: any version → v7
• actions/github-script: any version → v8
• actions/setup-python: any version → v6

Mirrors: NVIDIA/Megatron-LM@1d5e68b

Test plan

• Verify CI pipelines pass after merge

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated multiple GitHub Actions to latest major versions across CI/CD and workflow automation pipelines for improved stability and security. No functional changes.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: edf21173-c99e-4ab4-a44c-918285596518

📥 Commits

Reviewing files that changed from the base of the PR and between 9feb4b0 and 7e03c6b.

📒 Files selected for processing (7)

• .github/actions/test-template/action.yml
• .github/workflows/_automodel_integration_check.yml
• .github/workflows/_healthcheck_vm.yml
• .github/workflows/_pr_comment.yml
• .github/workflows/_submodule_check.yml
• .github/workflows/cicd-main.yml
• .github/workflows/healthcheck_vms.yml

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📝 Walkthrough

Walkthrough

GitHub Actions versions updated across multiple workflow files and a composite action. Updates include checkout (v2/v4→v6), upload-artifact (v4→v6), download-artifact (v4→v7), github-script (v7→v8), and setup-python (v5→v6), with no changes to workflow logic or configuration.

Changes

Cohort / File(s)	Summary
Checkout Action Updates .github/actions/test-template/action.yml, .github/workflows/_automodel_integration_check.yml, .github/workflows/_submodule_check.yml, .github/workflows/cicd-main.yml	Updated actions/checkout from v2/v4 to v6, preserving all input parameters and configurations.
Upload Artifact Action Updates .github/actions/test-template/action.yml, .github/workflows/_automodel_integration_check.yml, .github/workflows/_healthcheck_vm.yml, .github/workflows/_submodule_check.yml, .github/workflows/cicd-main.yml	Updated actions/upload-artifact from v4 to v6, maintaining all conditional logic and artifact settings.
Download Artifact Action Updates .github/workflows/cicd-main.yml, .github/workflows/healthcheck_vms.yml	Updated actions/download-artifact from v4 to v7, preserving input parameters and merge behavior.
GitHub-Script Action Updates .github/workflows/_automodel_integration_check.yml, .github/workflows/_pr_comment.yml, .github/workflows/_submodule_check.yml	Updated actions/github-script from v7 to v8 across multiple workflows, with no script logic changes.
Setup-Python Action Updates .github/workflows/cicd-main.yml	Updated actions/setup-python from v5 to v6 in the lint-check job.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately describes the main change: upgrading GitHub Actions to newer versions for Node.js 24 compatibility, which is the primary objective of all changes across multiple workflow files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	PR contains only minor infrastructure changes—GitHub Actions version upgrades with no modifications to workflow logic, scripts, or code behavior.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ko3n1g/upgrade-github-actions-node24

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